Test Discovery - TypeError: Cannot read property 'functions' of undefined

[amittleider]

When running the discover on Nosetests, I receive an error for some workspaces saying "Test Discover Failed. TypeError: Cannot read property 'functions' of undefined."

There was a time in the past when the test discovery did work on this particular workspace, but my codebase has changed and so has the python extension.

There is a related issue here: #5458 but that issue looks related to pytest extensions. My setup is using Nosetests instead.

The full exception is:

Python Extension: displayDiscoverStatus TypeError: Cannot read property 'functions' of undefined
	at module.exports.h.parseNoseTestModuleCollectionResult.t.forEach.t (/home/mitt/.vscode/extensions/ms-python.python-2019.4.12954/out/client/extension.js:83:821676)
	at Array.forEach (<anonymous>)
	at h.parseNoseTestModuleCollectionResult (/home/mitt/.vscode/extensions/ms-python.python-2019.4.12954/out/client/extension.js:83:819869)
	at module.exports.h.getTestFiles.e.split.forEach (/home/mitt/.vscode/extensions/ms-python.python-2019.4.12954/out/client/extension.js:83:819494)
	at Array.forEach (<anonymous>)
	at h.getTestFiles (/home/mitt/.vscode/extensions/ms-python.python-2019.4.12954/out/client/extension.js:83:819375)
	at h.parse (/home/mitt/.vscode/extensions/ms-python.python-2019.4.12954/out/client/extension.js:83:819187)
	at h.discoverTests (/home/mitt/.vscode/extensions/ms-python.python-2019.4.12954/out/client/extension.js:83:818407)
t.log @ workbench.main.js:238

Environment data

• VS Code version: 1.34.0
• Extension version (available under the Extensions sidebar): 2019.4.12954 (and tried on 2019.1.0 as well, but the exception occurs here as well)
• OS and version: Ubuntu 18.04
• Python version (& distribution if applicable, e.g. Anaconda): 3.6.8
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): venv
• Relevant/affected Python packages and their versions: nosetests

Expected behaviour

Discover the unit tests

Actual behaviour

Doesn't discover the unit tests

[DonJayamanne]

@amittleider I'm sorry to hear about this issue. As this is an issue that occurs in some workspaces and not others, its possible the code has hit some edge case or the like.
Please could you provide a sample repo we can use to replicate this at our end.

[amittleider]

I'm closing this, the problem was with my workspace configuration having an invalid nosetests argument.